MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context

J. Aleksić; S. Ansoldi; L. A. Antonelli; P. Antoranz; A. Babic; P. Bangale; J. A. Barrio; J. Becerra González; W. Bednarek; E. Bernardini; B. Biasuzzi; A. Biland; O. Blanch; S. Bonnefoy; G. Bonnoli; F. Borracci; T. Bretz; E. Carmona; A. Carosi; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; S. Covino; P. Da Vela; F. Dazzi; A. De Angelis; G. De Caneva; B. De Lotto; E. De Oña Wilhelmi; C. Delgado Mendez; M. Doert; D. Dominis Prester; D. Dorner; M. Doro; S. Einecke; D. Eisenacher; D. Elsaesser; M. V. Fonseca; L. Font; K. Frantzen; C. Fruck; D. Galindo; R. J. García López; M. Garczarczyk; D. Garrido Terrats; M. Gaug; N. Godinović; A. González Muñoz; S. R. Gozzini; D. Hadasch; Y. Hanabata; M. Hayashida; J. Herrera; D. Hildebrand; J. Hose; D. Hrupec; W. Idec; V. Kadenius; H. Kellermann; K. Kodani; Y. Konno; J. Krause; H. Kubo; J. Kushida; A. La Barbera; D. Lelas; N. Lewandowska; E. Lindfors; S. Lombardi; M. López; R. López-Coto; A. López-Oramas; E. Lorenz; I. Lozano; M. Makariev; K. Mallot; G. Maneva; N. Mankuzhiyil; K. Mannheim; L. Maraschi; B. Marcote; M. Mariotti; M. Martínez; D. Mazin; U. Menzel; J. M. Miranda; R. Mirzoyan; A. Moralejo; P. Munar-Adrover; D. Nakajima; A. Niedzwiecki; K. Nilsson; K. Nishijima; K. Noda; N. Nowak; R. Orito; A. Overkemping; S. Paiano; M. Palatiello; D. Paneque; R. Paoletti; J. M. Paredes; X. Paredes-Fortuny; M. Persic; P. G. Prada Moroni; E. Prandini; S. Preziuso; I. Puljak; R. Reinthal; W. Rhode; M. Ribó; J. Rico; J. Rodriguez Garcia; S. Rügamer; A. Saggion; T. Saito; K. Saito; K. Satalecka; V. Scalzotto; V. Scapin; C. Schultz; T. Schweizer; A. Sillanpää; J. Sitarek; I. Snidaric; D. Sobczynska; F. Spanier; V. Stamatescu; A. Stamerra; T. Steinbring; J. Storz; M. Strzys; L. Takalo; H. Takami; F. Tavecchio; P. Temnikov; T. Terzić; D. Tescaro; M. Teshima; J. Thaele; O. Tibolla; D. F. Torres; T. Toyama; A. Treves; M. Uellenbeck; P. Vogler; R. M. Wagner; R. Zanin; M. Bogosavljevic; Z. Ioannou; C. W. Mauche; E. V. Palaiologou; M. A. Pérez-Torres; T. Tuominen

doi:10.1051/0004-6361/201424072

MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context

J. Aleksić, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babic, P. Bangale, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, B. Biasuzzi, A. Biland, O. Blanch, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, P. ColinE. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, G. De Caneva, B. De Lotto, E. De Oña Wilhelmi, C. Delgado Mendez, M. Doert, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher, D. Elsaesser, M. V. Fonseca, L. Font, K. Frantzen, C. Fruck, D. Galindo, R. J. García López, M. Garczarczyk, D. Garrido Terrats, M. Gaug, N. Godinović, A. González Muñoz, S. R. Gozzini, D. Hadasch, Y. Hanabata, M. Hayashida, J. Herrera, D. Hildebrand, J. Hose, D. Hrupec, W. Idec, V. Kadenius, H. Kellermann, K. Kodani, Y. Konno, J. Krause, H. Kubo, J. Kushida, A. La Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, M. López, R. López-Coto, A. López-Oramas^*, E. Lorenz, I. Lozano, M. Makariev, K. Mallot, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Martínez, D. Mazin, U. Menzel, J. M. Miranda, R. Mirzoyan, A. Moralejo, P. Munar-Adrover, D. Nakajima, A. Niedzwiecki, K. Nilsson, K. Nishijima, K. Noda, N. Nowak, R. Orito, A. Overkemping, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, X. Paredes-Fortuny, M. Persic, P. G. Prada Moroni, E. Prandini, S. Preziuso, I. Puljak, R. Reinthal, W. Rhode, M. Ribó, J. Rico, J. Rodriguez Garcia, S. Rügamer, A. Saggion, T. Saito, K. Saito, K. Satalecka, V. Scalzotto, V. Scapin, C. Schultz, T. Schweizer, A. Sillanpää, J. Sitarek, I. Snidaric, D. Sobczynska, F. Spanier, V. Stamatescu, A. Stamerra, T. Steinbring, J. Storz, M. Strzys, L. Takalo, H. Takami, F. Tavecchio, P. Temnikov, T. Terzić, D. Tescaro, M. Teshima, J. Thaele, O. Tibolla, D. F. Torres, T. Toyama, A. Treves, M. Uellenbeck, P. Vogler, R. M. Wagner, R. Zanin, M. Bogosavljevic, Z. Ioannou, C. W. Mauche, E. V. Palaiologou, M. A. Pérez-Torres, T. Tuominen

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Context. It has been claimed that the nova-like cataclysmic variable AE Aquarii (AE Aqr) is a very-high-energy (VHE, E>100 GeV) source both on observational and theoretical grounds. Aims. We search for VHE-ray emission from AE Aqr during different states of the source at several wavelengths to confirm or rule out previous claims of detection of and-ray emission from this object. Methods. We report on observations of AE Aqr performed by MAGIC. The source was observed during 12 h as part of a multiwavelength campaign carried out between May and June 2012 covering the optical, X-ray, and γ-ray ranges. Besides MAGIC, the other facilities involved were the KVA, Skinakas, and Vidojevica telescopes in the optical and Swift in X-rays. We calculated integral upper limits coincident with different states of the source in the optical. We computed upper limits to the pulsed emission limiting the signal region to 30% of the phaseogram and we also searched for pulsed emission at different frequencies applying the Rayleigh test. Results. AE Aqr was not detected at VHEs during the multiwavelength campaign. We establish integral upper limits at the 95% confidence level for the steady emission assuming the differential flux proportional to a power-law function dφ/dE^-and, with a Crab-like photon spectral index of and = 2.6. The upper limit above 200 GeV is 6.4 and times; 10^-12 cm^-2 s^-1 and above 1 TeV is 7.4 × 10^-13 cm^-2 s^-1. We obtained an upper limit for the pulsed emission of 2.6 × 10^-12 cm ^-2s^-1 for energies above 200 GeV. Applying the Rayleigh test for pulsed emission at different frequencies we did not find any significant signal. Conclusions. Our results indicate that AE Aqr is not a VHE γ-ray emitter at the level of emission previously claimed. We have established the most constraining upper limits for the VHE γ-ray emission of AE Aqr.

Original language	English
Article number	A109
Journal	Astronomy and Astrophysics
Volume	568
DOIs	https://doi.org/10.1051/0004-6361/201424072
Publication status	Published - Aug 2014

Keywords

Accretion, accretion disks
Gamma rays: stars
Novae, cataclysmic variables
Radiation mechanisms: non-thermal

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201424072

Cite this

Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Bangale, P., Barrio, J. A., Becerra González, J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., ... Tuominen, T. (2014). MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context. Astronomy and Astrophysics, 568, Article A109. https://doi.org/10.1051/0004-6361/201424072

Aleksić, J, Ansoldi, S, Antonelli, LA, Antoranz, P, Babic, A, Bangale, P, Barrio, JA, Becerra González, J, Bednarek, W, Bernardini, E, Biasuzzi, B, Biland, A, Blanch, O, Bonnefoy, S, Bonnoli, G, Borracci, F, Bretz, T, Carmona, E, Carosi, A, Colin, P, Colombo, E, Contreras, JL, Cortina, J, Covino, S, Da Vela, P, Dazzi, F, De Angelis, A, De Caneva, G, De Lotto, B, De Oña Wilhelmi, E, Delgado Mendez, C, Doert, M, Dominis Prester, D, Dorner, D, Doro, M, Einecke, S, Eisenacher, D, Elsaesser, D, Fonseca, MV, Font, L, Frantzen, K, Fruck, C, Galindo, D, García López, RJ, Garczarczyk, M, Garrido Terrats, D, Gaug, M, Godinović, N, González Muñoz, A, Gozzini, SR, Hadasch, D, Hanabata, Y, Hayashida, M, Herrera, J, Hildebrand, D, Hose, J, Hrupec, D, Idec, W, Kadenius, V, Kellermann, H, Kodani, K, Konno, Y, Krause, J, Kubo, H, Kushida, J, La Barbera, A, Lelas, D, Lewandowska, N, Lindfors, E, Lombardi, S, López, M, López-Coto, R, López-Oramas, A, Lorenz, E, Lozano, I, Makariev, M, Mallot, K, Maneva, G, Mankuzhiyil, N, Mannheim, K, Maraschi, L, Marcote, B, Mariotti, M, Martínez, M, Mazin, D, Menzel, U, Miranda, JM, Mirzoyan, R, Moralejo, A, Munar-Adrover, P, Nakajima, D, Niedzwiecki, A, Nilsson, K, Nishijima, K, Noda, K, Nowak, N, Orito, R, Overkemping, A, Paiano, S, Palatiello, M, Paneque, D, Paoletti, R, Paredes, JM, Paredes-Fortuny, X, Persic, M, Prada Moroni, PG, Prandini, E, Preziuso, S, Puljak, I, Reinthal, R, Rhode, W, Ribó, M, Rico, J, Rodriguez Garcia, J, Rügamer, S, Saggion, A, Saito, T, Saito, K, Satalecka, K, Scalzotto, V, Scapin, V, Schultz, C, Schweizer, T, Sillanpää, A, Sitarek, J, Snidaric, I, Sobczynska, D, Spanier, F, Stamatescu, V, Stamerra, A, Steinbring, T, Storz, J, Strzys, M, Takalo, L, Takami, H, Tavecchio, F, Temnikov, P, Terzić, T, Tescaro, D, Teshima, M, Thaele, J, Tibolla, O, Torres, DF, Toyama, T, Treves, A, Uellenbeck, M, Vogler, P, Wagner, RM, Zanin, R, Bogosavljevic, M, Ioannou, Z, Mauche, CW, Palaiologou, EV, Pérez-Torres, MA & Tuominen, T 2014, 'MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context', Astronomy and Astrophysics, vol. 568, A109. https://doi.org/10.1051/0004-6361/201424072

@article{31cf0721b3b34892ad0fa81606c8877a,

title = "MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context",

abstract = "Context. It has been claimed that the nova-like cataclysmic variable AE Aquarii (AE Aqr) is a very-high-energy (VHE, E>100 GeV) source both on observational and theoretical grounds. Aims. We search for VHE-ray emission from AE Aqr during different states of the source at several wavelengths to confirm or rule out previous claims of detection of and-ray emission from this object. Methods. We report on observations of AE Aqr performed by MAGIC. The source was observed during 12 h as part of a multiwavelength campaign carried out between May and June 2012 covering the optical, X-ray, and γ-ray ranges. Besides MAGIC, the other facilities involved were the KVA, Skinakas, and Vidojevica telescopes in the optical and Swift in X-rays. We calculated integral upper limits coincident with different states of the source in the optical. We computed upper limits to the pulsed emission limiting the signal region to 30% of the phaseogram and we also searched for pulsed emission at different frequencies applying the Rayleigh test. Results. AE Aqr was not detected at VHEs during the multiwavelength campaign. We establish integral upper limits at the 95% confidence level for the steady emission assuming the differential flux proportional to a power-law function dφ/dE-and, with a Crab-like photon spectral index of and = 2.6. The upper limit above 200 GeV is 6.4 and times; 10-12 cm-2 s-1 and above 1 TeV is 7.4 × 10-13 cm-2 s-1. We obtained an upper limit for the pulsed emission of 2.6 × 10-12 cm -2s-1 for energies above 200 GeV. Applying the Rayleigh test for pulsed emission at different frequencies we did not find any significant signal. Conclusions. Our results indicate that AE Aqr is not a VHE γ-ray emitter at the level of emission previously claimed. We have established the most constraining upper limits for the VHE γ-ray emission of AE Aqr.",

keywords = "Accretion, accretion disks, Gamma rays: stars, Novae, cataclysmic variables, Radiation mechanisms: non-thermal",

author = "J. Aleksi{\'c} and S. Ansoldi and Antonelli, {L. A.} and P. Antoranz and A. Babic and P. Bangale and Barrio, {J. A.} and {Becerra Gonz{\'a}lez}, J. and W. Bednarek and E. Bernardini and B. Biasuzzi and A. Biland and O. Blanch and S. Bonnefoy and G. Bonnoli and F. Borracci and T. Bretz and E. Carmona and A. Carosi and P. Colin and E. Colombo and Contreras, {J. L.} and J. Cortina and S. Covino and {Da Vela}, P. and F. Dazzi and {De Angelis}, A. and {De Caneva}, G. and {De Lotto}, B. and {De O{\~n}a Wilhelmi}, E. and {Delgado Mendez}, C. and M. Doert and {Dominis Prester}, D. and D. Dorner and M. Doro and S. Einecke and D. Eisenacher and D. Elsaesser and Fonseca, {M. V.} and L. Font and K. Frantzen and C. Fruck and D. Galindo and {Garc{\'i}a L{\'o}pez}, {R. J.} and M. Garczarczyk and {Garrido Terrats}, D. and M. Gaug and N. Godinovi{\'c} and {Gonz{\'a}lez Mu{\~n}oz}, A. and Gozzini, {S. R.} and D. Hadasch and Y. Hanabata and M. Hayashida and J. Herrera and D. Hildebrand and J. Hose and D. Hrupec and W. Idec and V. Kadenius and H. Kellermann and K. Kodani and Y. Konno and J. Krause and H. Kubo and J. Kushida and {La Barbera}, A. and D. Lelas and N. Lewandowska and E. Lindfors and S. Lombardi and M. L{\'o}pez and R. L{\'o}pez-Coto and A. L{\'o}pez-Oramas and E. Lorenz and I. Lozano and M. Makariev and K. Mallot and G. Maneva and N. Mankuzhiyil and K. Mannheim and L. Maraschi and B. Marcote and M. Mariotti and M. Mart{\'i}nez and D. Mazin and U. Menzel and Miranda, {J. M.} and R. Mirzoyan and A. Moralejo and P. Munar-Adrover and D. Nakajima and A. Niedzwiecki and K. Nilsson and K. Nishijima and K. Noda and N. Nowak and R. Orito and A. Overkemping and S. Paiano and M. Palatiello and D. Paneque and R. Paoletti and Paredes, {J. M.} and X. Paredes-Fortuny and M. Persic and {Prada Moroni}, {P. G.} and E. Prandini and S. Preziuso and I. Puljak and R. Reinthal and W. Rhode and M. Rib{\'o} and J. Rico and {Rodriguez Garcia}, J. and S. R{\"u}gamer and A. Saggion and T. Saito and K. Saito and K. Satalecka and V. Scalzotto and V. Scapin and C. Schultz and T. Schweizer and A. Sillanp{\"a}{\"a} and J. Sitarek and I. Snidaric and D. Sobczynska and F. Spanier and V. Stamatescu and A. Stamerra and T. Steinbring and J. Storz and M. Strzys and L. Takalo and H. Takami and F. Tavecchio and P. Temnikov and T. Terzi{\'c} and D. Tescaro and M. Teshima and J. Thaele and O. Tibolla and Torres, {D. F.} and T. Toyama and A. Treves and M. Uellenbeck and P. Vogler and Wagner, {R. M.} and R. Zanin and M. Bogosavljevic and Z. Ioannou and Mauche, {C. W.} and Palaiologou, {E. V.} and P{\'e}rez-Torres, {M. A.} and T. Tuominen",

year = "2014",

month = aug,

doi = "10.1051/0004-6361/201424072",

language = "English",

volume = "568",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context

AU - Aleksić, J.

AU - Ansoldi, S.

AU - Antonelli, L. A.

AU - Antoranz, P.

AU - Babic, A.

AU - Bangale, P.

AU - Barrio, J. A.

AU - Becerra González, J.

AU - Bednarek, W.

AU - Bernardini, E.

AU - Biasuzzi, B.

AU - Biland, A.

AU - Blanch, O.

AU - Bonnefoy, S.

AU - Bonnoli, G.

AU - Borracci, F.

AU - Bretz, T.

AU - Carmona, E.

AU - Carosi, A.

AU - Colin, P.

AU - Colombo, E.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Covino, S.

AU - Da Vela, P.

AU - Dazzi, F.

AU - De Angelis, A.

AU - De Caneva, G.

AU - De Lotto, B.

AU - De Oña Wilhelmi, E.

AU - Delgado Mendez, C.

AU - Doert, M.

AU - Dominis Prester, D.

AU - Dorner, D.

AU - Doro, M.

AU - Einecke, S.

AU - Eisenacher, D.

AU - Elsaesser, D.

AU - Fonseca, M. V.

AU - Font, L.

AU - Frantzen, K.

AU - Fruck, C.

AU - Galindo, D.

AU - García López, R. J.

AU - Garczarczyk, M.

AU - Garrido Terrats, D.

AU - Gaug, M.

AU - Godinović, N.

AU - González Muñoz, A.

AU - Gozzini, S. R.

AU - Hadasch, D.

AU - Hanabata, Y.

AU - Hayashida, M.

AU - Herrera, J.

AU - Hildebrand, D.

AU - Hose, J.

AU - Hrupec, D.

AU - Idec, W.

AU - Kadenius, V.

AU - Kellermann, H.

AU - Kodani, K.

AU - Konno, Y.

AU - Krause, J.

AU - Kubo, H.

AU - Kushida, J.

AU - La Barbera, A.

AU - Lelas, D.

AU - Lewandowska, N.

AU - Lindfors, E.

AU - Lombardi, S.

AU - López, M.

AU - López-Coto, R.

AU - López-Oramas, A.

AU - Lorenz, E.

AU - Lozano, I.

AU - Makariev, M.

AU - Mallot, K.

AU - Maneva, G.

AU - Mankuzhiyil, N.

AU - Mannheim, K.

AU - Maraschi, L.

AU - Marcote, B.

AU - Mariotti, M.

AU - Martínez, M.

AU - Mazin, D.

AU - Menzel, U.

AU - Miranda, J. M.

AU - Mirzoyan, R.

AU - Moralejo, A.

AU - Munar-Adrover, P.

AU - Nakajima, D.

AU - Niedzwiecki, A.

AU - Nilsson, K.

AU - Nishijima, K.

AU - Noda, K.

AU - Nowak, N.

AU - Orito, R.

AU - Overkemping, A.

AU - Paiano, S.

AU - Palatiello, M.

AU - Paneque, D.

AU - Paoletti, R.

AU - Paredes, J. M.

AU - Paredes-Fortuny, X.

AU - Persic, M.

AU - Prada Moroni, P. G.

AU - Prandini, E.

AU - Preziuso, S.

AU - Puljak, I.

AU - Reinthal, R.

AU - Rhode, W.

AU - Ribó, M.

AU - Rico, J.

AU - Rodriguez Garcia, J.

AU - Rügamer, S.

AU - Saggion, A.

AU - Saito, T.

AU - Saito, K.

AU - Satalecka, K.

AU - Scalzotto, V.

AU - Scapin, V.

AU - Schultz, C.

AU - Schweizer, T.

AU - Sillanpää, A.

AU - Sitarek, J.

AU - Snidaric, I.

AU - Sobczynska, D.

AU - Spanier, F.

AU - Stamatescu, V.

AU - Stamerra, A.

AU - Steinbring, T.

AU - Storz, J.

AU - Strzys, M.

AU - Takalo, L.

AU - Takami, H.

AU - Tavecchio, F.

AU - Temnikov, P.

AU - Terzić, T.

AU - Tescaro, D.

AU - Teshima, M.

AU - Thaele, J.

AU - Tibolla, O.

AU - Torres, D. F.

AU - Toyama, T.

AU - Treves, A.

AU - Uellenbeck, M.

AU - Vogler, P.

AU - Wagner, R. M.

AU - Zanin, R.

AU - Bogosavljevic, M.

AU - Ioannou, Z.

AU - Mauche, C. W.

AU - Palaiologou, E. V.

AU - Pérez-Torres, M. A.

AU - Tuominen, T.

PY - 2014/8

Y1 - 2014/8

N2 - Context. It has been claimed that the nova-like cataclysmic variable AE Aquarii (AE Aqr) is a very-high-energy (VHE, E>100 GeV) source both on observational and theoretical grounds. Aims. We search for VHE-ray emission from AE Aqr during different states of the source at several wavelengths to confirm or rule out previous claims of detection of and-ray emission from this object. Methods. We report on observations of AE Aqr performed by MAGIC. The source was observed during 12 h as part of a multiwavelength campaign carried out between May and June 2012 covering the optical, X-ray, and γ-ray ranges. Besides MAGIC, the other facilities involved were the KVA, Skinakas, and Vidojevica telescopes in the optical and Swift in X-rays. We calculated integral upper limits coincident with different states of the source in the optical. We computed upper limits to the pulsed emission limiting the signal region to 30% of the phaseogram and we also searched for pulsed emission at different frequencies applying the Rayleigh test. Results. AE Aqr was not detected at VHEs during the multiwavelength campaign. We establish integral upper limits at the 95% confidence level for the steady emission assuming the differential flux proportional to a power-law function dφ/dE-and, with a Crab-like photon spectral index of and = 2.6. The upper limit above 200 GeV is 6.4 and times; 10-12 cm-2 s-1 and above 1 TeV is 7.4 × 10-13 cm-2 s-1. We obtained an upper limit for the pulsed emission of 2.6 × 10-12 cm -2s-1 for energies above 200 GeV. Applying the Rayleigh test for pulsed emission at different frequencies we did not find any significant signal. Conclusions. Our results indicate that AE Aqr is not a VHE γ-ray emitter at the level of emission previously claimed. We have established the most constraining upper limits for the VHE γ-ray emission of AE Aqr.

AB - Context. It has been claimed that the nova-like cataclysmic variable AE Aquarii (AE Aqr) is a very-high-energy (VHE, E>100 GeV) source both on observational and theoretical grounds. Aims. We search for VHE-ray emission from AE Aqr during different states of the source at several wavelengths to confirm or rule out previous claims of detection of and-ray emission from this object. Methods. We report on observations of AE Aqr performed by MAGIC. The source was observed during 12 h as part of a multiwavelength campaign carried out between May and June 2012 covering the optical, X-ray, and γ-ray ranges. Besides MAGIC, the other facilities involved were the KVA, Skinakas, and Vidojevica telescopes in the optical and Swift in X-rays. We calculated integral upper limits coincident with different states of the source in the optical. We computed upper limits to the pulsed emission limiting the signal region to 30% of the phaseogram and we also searched for pulsed emission at different frequencies applying the Rayleigh test. Results. AE Aqr was not detected at VHEs during the multiwavelength campaign. We establish integral upper limits at the 95% confidence level for the steady emission assuming the differential flux proportional to a power-law function dφ/dE-and, with a Crab-like photon spectral index of and = 2.6. The upper limit above 200 GeV is 6.4 and times; 10-12 cm-2 s-1 and above 1 TeV is 7.4 × 10-13 cm-2 s-1. We obtained an upper limit for the pulsed emission of 2.6 × 10-12 cm -2s-1 for energies above 200 GeV. Applying the Rayleigh test for pulsed emission at different frequencies we did not find any significant signal. Conclusions. Our results indicate that AE Aqr is not a VHE γ-ray emitter at the level of emission previously claimed. We have established the most constraining upper limits for the VHE γ-ray emission of AE Aqr.

KW - Accretion, accretion disks

KW - Gamma rays: stars

KW - Novae, cataclysmic variables

KW - Radiation mechanisms: non-thermal

UR - http://www.scopus.com/inward/record.url?scp=84906748383&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84906748383&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201424072

DO - 10.1051/0004-6361/201424072

M3 - Article

AN - SCOPUS:84906748383

SN - 0004-6361

VL - 568

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A109

ER -

MAGIC search for vhe γ-ray emission from ae aquarii in a multiwavelength context

Abstract

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